How to pronunce the plural forms of nouns

In American English, the sound of "s" depends on which sound comes before it.

1. If the noun ends in an unvoiced consonant sound: /f/, /k/, /p/, /t/, /th/-(thin), pronounce "s" as /s/.

2. When it ends in a voiced consonant sound, /b/, /d/, /g/, /l/, /m/, /n/, /ng/, /r/ or with a vowel sound, /a/, /e/, /i/, /o/, /u/, pronounce "s" as /z/.

3. If it ends with /s/, /z/, /sh/, /ch/-chair, /zh/-the second "g" in garage, /dz/-(j), pronounce "s" or "-es" as /iz/.

In other words, if the noun ends with a sound other than the 5 unvoiced consonants, pronounce "s" with a /z/ (or with an /iz/ as the case may be).

Plural forms

Most nouns in English have both singular and plural forms, and the plural is usually formed by adding "-s" to the singular. Most nouns in English have both singular and plural forms, and the plural is usually formed by adding “-s” to the singular. This page explains the basic ways of forming regular plurals in English. For information about forming irregular plurals see Irrgular Plurals of Nouns.
How to form the plural
Noun ending Forming the plural Example
s, x, ch or sh Add -es

boss arrow to the right bosses
tax arrow to the right taxes
bush arrow to the right bushes
consonant + y Change y to i then add -es baby arrow to the rightbabies
candy arrow to the rightcandies
curry arrow to the right curries
most others Add -s

cat arrow to the right cats
face arrow to the right faces
day arrow to the right days